If you’re a board designer, you normally only worry about the inductive coupling strength through the core as well as isolation as these specifications will determine the power conversion efficiency as well as the level of isolation across the coils. Instead, the coil and core design could be somewhat complex, involving laminated, core-shell, or stacked topologies. Real transformers do not always use the type of simple structure shown in some diagrams, where a square magnetic core is wrapped with coils to provide magnetic coupling. This need for isolation is an important specification we’ll discuss below. The input side of the board, which could present a safety hazard to the user, is isolated from the output side. The important point here is that power transfer occurs between coils while keeping the two sides of the transformer isolated. A PCB-mount transformer is designed to be integrated into your board alongside other components (digital section, power conditioning, etc.) in order to provide power transfer between two circuits. Transformers generally consist of two physically separated coils that are inductively coupled through the magnetic field, which is incident between the primary and secondary coils. We’ll look at some of the important transformer specifications to consider when using these components in different types of power regulation systems. PCB-mount transformers come in a range of sizes, being packaged as either small SMD components for low or large mechanically-mounted through-hole components for high-power handling. In this article, we’ll look at some of the PCB transformer options you’ll find available that can give you high isolation when used in power conversion in your PCB.Īnother important point to consider is how to select PCB-mount transformers for use in your new design. There are many types of transformers that can be mounted to your case/chassis, or directly to your PCB. These components use magnetic induction to transfer power between two coils without requiring a direct mechanical connection by varying the current in one of the coils. AC to DC power conversion starts with a deceptively simple device: the transformer.
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